Forward and Reverse Linear Motion over a 24 foot span

[Big_Deddie]

First post here (just as an FYI) and, yes, I did try the search function before posting. Did find some similar postings but not exactly what I was looking for.
Any suggestions for a small drive motor that can move in forward and reverse directions with the flip of a switch?

I have a device that will be suspended from an overhead rail system. There will be two rails 10' (centered) apart from each other - like an overhead crane system. The device will weigh about 1000 lbs (max) and will experience about 1000 lbs of resistance force in each direction - picture a bulldozer moving light weight dirt.

The system will start at one end of a 24' long rail and move to the other end. Then it will rest until the operator sends it back to the original start position.

I will need two motors - each motor should be able to move 500 lbs of dead weight (weight of the device) and be able to overcome the resistance force of 500 lbs linearly.

I am not very familiar with electric motors, so I am asking for help and/or suggestions for this one. I am NOT opposed to other drive line (hydraulic, pneumatic, etc)suggestions either. I have the rest of the system designed out - just need to figure out the drive system so I can finalize the design.

I have a max budget (design and build) of $10,000 but would prefer being way under if possible.

Any/All help is appreciated.

 

[3DDave]

How fast?

 

[SwinnyGG]

How fast?

Dave's question is 1a on the list of most important questions.

How much accuracy is required?


The above question is 1b.


19 more to go.

 

[Big_Deddie]

Speed is not a major concern. I am thinking a travel time (one direction) of 1 - 2 minutes max for the 24'. Speed really isn't a MAJOR concern...

 

[3DDave]

1000lbf * 24 ft / 120 seconds = 200ft-lbf/second = about 1/3 horsepower total.

Unless you are lifting the weight that should have little effect except as to how acceleration is limited by the mass.

I'd select a 1 HP setup to cover for unforeseen changes. System stiffness is also a consideration to avoid stick-slip/shuddering. Coordinating the two supports will either take a mechanical connection or use two motors and use a servo system.

 

[Big_Deddie]

Thank you 3DDave

Now - why can't i reply directly to threads or quote anyone? Is that a time-here thing?